diff options
| author | Dan Williams <dan.j.williams@intel.com> | 2017-02-08 10:27:01 +1100 |
|---|---|---|
| committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2017-02-08 10:27:01 +1100 |
| commit | 7b96d11c60a1844fbb6dd91dc97d9044a856d518 (patch) | |
| tree | 714e5afb9b4c7ead040f1a6e1a46391a689983be /mm/memory_hotplug.c | |
| parent | 97d11d8fb51ffe27807db971587c5699a902fb25 (diff) | |
mm: introduce struct mem_section_usage to track partial population of a section
'struct mem_section_usage' combines the existing 'pageblock_flags' bitmap
with a new 'map_active' bitmap. The new bitmap enables the memory
hot{plug,remove} implementation to act on incremental sub-divisions of a
section. The primary impetus for this functionality is to support
platforms that mix "System RAM" and "Persistent Memory" within a single
section. We want to be able to hotplug "Persistent Memory" to extend a
partially populated section and share that section between ZONE_DEVICE and
ZONE_NORMAL/MOVABLE memory.
This introduces a pointer to the new 'map_active' bitmap through struct
mem_section, but otherwise should not change any behavior.
Link: http://lkml.kernel.org/r/148486361735.19694.17147399375362860739.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Logan Gunthorpe <logang@deltatee.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Stephen Bates <stephen.bates@microsemi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/memory_hotplug.c')
| -rw-r--r-- | mm/memory_hotplug.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 7858d0df2da7..29f7a7ce7a34 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -228,7 +228,7 @@ static void register_page_bootmem_info_section(unsigned long start_pfn) for (i = 0; i < mapsize; i++, page++) get_page_bootmem(section_nr, page, SECTION_INFO); - usemap = __nr_to_section(section_nr)->pageblock_flags; + usemap = section_to_usemap(__nr_to_section(section_nr)); page = virt_to_page(usemap); mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT; @@ -254,7 +254,7 @@ static void register_page_bootmem_info_section(unsigned long start_pfn) register_page_bootmem_memmap(section_nr, memmap, PAGES_PER_SECTION); - usemap = __nr_to_section(section_nr)->pageblock_flags; + usemap = section_to_usemap(__nr_to_section(section_nr)); page = virt_to_page(usemap); mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT; |